Date: Thu, 19 May 2011 10:46:25 -0700
From: Nishanth Aravamudan <nacc@us.ibm.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Milton Miller <miltonm@bga.com>, Paul Mackerras <paulus@samba.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Grant Likely <grant.likely@secretlab.ca>,
        Andrew Morton <akpm@linux-foundation.org>,
        FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>,
        Anton Blanchard <anton@samba.org>,
        Sonny Rao <sonnyrao@linux.vnet.ibm.com>,
        Will Schmidt <will_schmidt@vnet.ibm.com>,
        linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
        cbe-oss-dev@lists.ozlabs.org, devicetree-discuss@lists.ozlabs.org
Subject: Re: [PATCH 5/8] powerpc: override dma_get_required_mask by platform
 hook and ops
Message-ID: <20110519174625.GA3338@us.ibm.com>
References: <1305152704-4864-1-git-send-email-nacc@us.ibm.com>
 <1305152704-4864-6-git-send-email-nacc@us.ibm.com>
 <1305791036.7481.52.camel@pasglop>
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On 19.05.2011 [17:43:56 +1000], Benjamin Herrenschmidt wrote:
> On Wed, 2011-05-11 at 15:25 -0700, Nishanth Aravamudan wrote:
> > From: Milton Miller <miltonm@bga.com>
> > 
> > The hook dma_get_required_mask is supposed to return the mask required
> > by the platform to operate efficently.  The generic version of
> > dma_get_required_mask in driver/base/platform.c returns a mask based
> > only on max_pfn.  However, this is likely too big for iommu systems
> > and could be too small for platforms that require a dma offset or have
> > a secondary window at a high offset.
> 
> The result of those 3 patches doesn't build on top of my current tree,
> the generic dma_ops lacks the dma_get_required_mask hook. I'll have a
> look again after the merge window.

Hrm, I think it's because for whatever reason [1] I forgot to cc you on 6/8?

https://lkml.org/lkml/2011/5/11/473

-Nish

[1] AKA over-reliance on get_maintainer.pl and lack of mental oversight!

-- 
Nishanth Aravamudan <nacc@us.ibm.com>
IBM Linux Technology Center
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